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LONG-TERM DEBT Part 2 - Narrative (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2013 | Sep. 30, 2013 No Call Options [Member] | Sep. 30, 2013 Make Whole Call Options [Member] | Sep. 30, 2013 Callable at par in 2013 [Member] Three to six months prior to maturity [Member] | Sep. 30, 2013 Callable at par in 2013 [Member] Beginning October 2013 [Member] | Sep. 30, 2013 Laclede Gas [Member] | Sep. 30, 2012 Laclede Gas [Member] | Nov. 26, 2013 Laclede Gas [Member] Subsequent Event [Member] | Aug. 13, 2013 First Mortgage [Member] Laclede Gas [Member] | Mar. 15, 2013 First Mortgage [Member] Laclede Gas [Member] | Oct. 15, 2012 First Mortgage Bonds 6.5% Series, due October 15, 2012 [Member] First Mortgage [Member] Laclede Gas [Member] | Dec. 14, 2012 3.31% Notes Payable, due December 15, 2022 [Member] Unsecured Debt [Member] | Sep. 30, 2013 First Mortage Bonds 3% Series, due March 15, 2023 [Member] Laclede Gas [Member] | Sep. 30, 2012 First Mortage Bonds 3% Series, due March 15, 2023 [Member] Laclede Gas [Member] | Mar. 15, 2013 First Mortage Bonds 3% Series, due March 15, 2023 [Member] First Mortgage [Member] Laclede Gas [Member] | Sep. 30, 2013 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] Laclede Gas [Member] | Sep. 30, 2012 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] Laclede Gas [Member] | Mar. 15, 2013 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] First Mortgage [Member] Laclede Gas [Member] | Sep. 30, 2013 First Mortage Bonds 2% Series, due August 15, 2018 [Member] Laclede Gas [Member] | Sep. 30, 2012 First Mortage Bonds 2% Series, due August 15, 2018 [Member] Laclede Gas [Member] | Aug. 13, 2013 First Mortage Bonds 2% Series, due August 15, 2018 [Member] First Mortgage [Member] Laclede Gas [Member] | Sep. 30, 2013 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] Laclede Gas [Member] | Sep. 30, 2012 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] Laclede Gas [Member] | Aug. 13, 2013 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] First Mortgage [Member] Laclede Gas [Member] | Sep. 30, 2013 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] Laclede Gas [Member] | Sep. 30, 2012 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] Laclede Gas [Member] | Aug. 13, 2013 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] First Mortgage [Member] Laclede Gas [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity of first mortgage bonds | $ 25,000,000 | $ 0 | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 3.31% | 3.00% | 3.00% | 3.00% | 3.40% | 3.40% | 3.40% | 2.00% | 2.00% | 2.00% | 3.40% | 3.40% | 3.40% | 4.625% | 4.625% | 4.625%
Debt issued, maturity term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  | 10 years |  |  | 15 years |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 | 100,000,000 |  | 25,000,000 |  |  | 55,000,000 |  |  | 45,000,000 |  |  | 100,000,000 |  |  | 250,000,000 |  |  | 100,000,000
Fixed-rate long-term debt amount | 915,000,000 |  |  |  | 50,000,000 | 435,000,000 | 350,000,000 | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MoPSC authorized debt issuance through June 30, 2013 - maximum available |  |  |  | 518,000,000 |  |  |  |  | 518,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period for debt securities and preferred stock issuance authority | 2 years |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MoPSC authorized debt issuance - remaining available | $ 370,800,000 |  |  |  |  |  |  |  |  |  | $ 370,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized (in shares) |  |  |  |  |  |  |  |  | 1,480,000 | 1,480,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount authorized by state regulatory authorities for the issuance of debt securities, preferred stock, capital leases, and to issue common stock and receive paid-in capital which remains available to issue at period end. + References No definition available. + Details
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- Definition The period of time for which the company's authority to issue a specified amount of debt securities and preferred stock was extended, in the format PnYnMnD. + References No definition available. + Details
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- Definition Amount authorized by state regulatory authorities for the issuance of debt securities, preferred stock, capital leases, and to issue common stock and receive paid-in capital. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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